Signal horn



Fan. 9, 1923.

SIGNAL HORN. FILED-NOV. I7. 1919.

' 3,441,492 J. c. COULUMBE.

l atented Jan. 9, 1923.

JOSEPH C. GOULQIVIBE, 0F DRACUT, MASSACHUSETTS.

SIGNAL HORN.

Application filed November 17, 1919.

To all whom it may concern:

Be it known that I, Josnrn C. Counoiren,

a citizen of the United States, residing at Dracut, I county ofMiddlesex, Commonwealth of Massachusetts, have invented certain new anduseful Improvements in Signal Horns, of which the following is aspecification.

My present invention relates to certain pled with the factor or wear. Myinvention therefore contemplates a horn structure in whlch an extremelyrapid vibratlon may be quickly set up and sustalned witha-mimmum ofshock and wear to the mechanical parts. I

In carrying out my invention I employ an axial shaft, that is to say, ashaft lying in or substantially in the axis of the diaphragm. Theobjections to so disposing a shaft lays in the apparent conflictofmultiple contact in the rotor and concentricity of diaphragm impact. Iam able to accomplish the desired features of both axial alinement andcentral impact by a simple arrangement of contacting elements by whichimpacting vibration is multiplied. At the same time my invention lendsitself to advantageous structure, efficient, symmetrical, economical anddurable. Throughout the specification and drawings likereferencenumerals are employed to indicate corresponding parts, and inthe drawings:

Fig. I is a side view partly in section of a horn in accordance withinyinvention.

Fig. II is a rear view of the horn cup.

Fig. III a fragmentary portion of the diaphragm showing the cam buttonstem opening.

Fig. IV a side elevation of front cam face and rear view respectively ofthe cam button, and Y Fig. V a front face and fragmentary side sectionof the rotary shaft head.

In the form of horn shown as illustrative of my invention I provide abody portion consisting of a motor casing 1 having bearing portions 2and 3 on each side thereof in a Xial alinement with the armature shaft.This armature shaft is continued as the main rotor shaft 4t which findshearings in 2 and Serial No. 338,468.

3 at 5 and 6 which are oiled at 7 One end of the shaft '4: is slightlyconcaved as at 4 Against this concavity rests aspherical follower 8 heldin place by a spring 9 adjustable by a plug 10 screwed into theextension 2 and held by a lock nut 11 threaded on the plug. I

On the inner end of the shaft 4 is a rotor member 12 having cam teeth13. Within a shell 15 mounted on the end of theportion is a diaphragmcasing within which is a diaphragm 16. The diaphragm 16 is fitted at itscenter with a button 17 having cam teeth 18. The stem 19 is slightlyflattened asi'ndicated at 19 Fig. IV, and fits through a similarlyshaped opening 16 in the diaphragm 16, and also through a similaropening in a collared washer 20 A. spring 20 is disposed between this-collared washer and the shouldered head of' an. adjustable stem 21which is threaded throughla reinforced yoke 22 which is set within theshell 15 of the diaphragm casingand projects slightly within thehornmember 24. which is also attached to that casingf Upon the rotationofthe shaft 4 in the motor 1 the rotor head 12 through its followingspring 9 works yieldingly against the button 17. The cam teeth of therotor head and the buttoniare one of an odd numher and one ofan evennumber. In the form shown the rotor head has two cam teeth 13,

while the button has five of such teeth.

speed vibration giving the desired pit'chfto the horn.

It will be noted that the shaft 4 is dis posed axially of the diaphragmand symmetrically-on the central axis of the horn. This not only makes avery convenient and satisfactory structure, strong and pleasing inappearance but as in the form shown gives a very high efiiciency.

Through the relation of the odd and even numbers of the cam teeth it ispossible with this central axial alinement to get the high vibrationdesired. The axial yielding of these alined members insures not onlyprompt engagement and release, but'also introduces a factor of greatsaving in wear. Various modifications may obviously be made in the typeof horn as well as in the form of structure and arrangement of theseveral parts all such modification and variation may be made withoutdeparting from the spirit of my invention it within the limits of theappended claims.

What I therefore claim and desire to secure by Letters Patent is:

1. In a horn, a diaphragm, a rotor shaft in central axial alinementtherewith, a spring pressed follower behind said shaft, and a springpressed follower on the opposite sideof said diaphragm and alined withsaid shaft.

2. In horn, a diaphragm, a rotor shaft in central axial alinementtherewith, an adj ustable spring )ressed follower behind said shaft, andan acjustable spring pressed follower on the opposite side of saiddiaphragm and aimed with said shaft.

3. In a warning signal, a diaphragm as-- ing having a sound-emission'opening in a wall thereof, a horn having its inner end seated in saidopening, and a perforated member disposed within said horn and adjistably clamping said horn in said position.

l; In a warning signal, a'casing having a sound-emission opening in awall thereof, a perforated member set acrosssaid opening with its inneredge seated against the inner face of the casing Wall adjacent saidvopening, and means adjnstably clamping said member in said relation.

5. In a warning signal, a casing having a sound-emission opening in awall thereof,

an outwardly disposed perforated member set across said opening with itsinner edge seated against the inner face of the casing Wall acent saidopening, and a spring-tensioned follower adjustably clamping said memberin said relation.

6. In a warning signal, a diaphragm casing having a sound-emissionopening in a wall thereof, a perforated member set across said openingwith its inner edge seated interiorly of the casing wall adjacent saidopening, a follower adjustable in said member, a diaphragm in saidcasing, and a spring interposed between said follower and the diaphragmfor clamping said member in said relation. v

7. In a warning signal, a diaphragm casi'n'g having a sound-emissionopening in a wall thereof, an outwardly bowed perforated member setacross said opening with its inner edge seated interiorly of the casingwall adjacent said opening, said member having a bearing, a followeradjustable in said bearing, a diaphragm in said casing, a button on saiddiaphragm alined with said follower, and a spring interposed betweensaid follower and the diaphragm button for clamping said member in saidrelation.

In testimony whereof I aflix my signatur in presence of two witnesses. Ve

JOSEPH C. COULOMBE. IVitnesses DUDLEY E. CorLIss, VVILFRED M. Hnnn'nr.

